CN111715664A - Treatment method for recycling carbonized industrial waste salt - Google Patents
Treatment method for recycling carbonized industrial waste salt Download PDFInfo
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- CN111715664A CN111715664A CN202010590294.3A CN202010590294A CN111715664A CN 111715664 A CN111715664 A CN 111715664A CN 202010590294 A CN202010590294 A CN 202010590294A CN 111715664 A CN111715664 A CN 111715664A
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- 150000003839 salts Chemical class 0.000 title claims abstract description 84
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000004064 recycling Methods 0.000 title claims description 13
- 239000002440 industrial waste Substances 0.000 title claims description 11
- 238000003763 carbonization Methods 0.000 claims abstract description 35
- 238000001035 drying Methods 0.000 claims abstract description 24
- 238000001914 filtration Methods 0.000 claims abstract description 14
- 238000000108 ultra-filtration Methods 0.000 claims abstract description 12
- 238000002425 crystallisation Methods 0.000 claims abstract description 10
- 230000008025 crystallization Effects 0.000 claims abstract description 10
- 239000000243 solution Substances 0.000 claims abstract description 10
- 239000004902 Softening Agent Substances 0.000 claims abstract description 9
- 239000006229 carbon black Substances 0.000 claims abstract description 9
- 239000010865 sewage Substances 0.000 claims abstract description 8
- 238000010000 carbonizing Methods 0.000 claims abstract description 7
- 238000000926 separation method Methods 0.000 claims abstract description 5
- 239000002244 precipitate Substances 0.000 claims abstract description 4
- 239000012266 salt solution Substances 0.000 claims abstract description 4
- 238000001816 cooling Methods 0.000 claims abstract 2
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 239000000126 substance Substances 0.000 claims description 7
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical group [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 6
- 239000012065 filter cake Substances 0.000 claims description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 3
- 238000011085 pressure filtration Methods 0.000 claims description 2
- 238000004090 dissolution Methods 0.000 claims 1
- 229910017053 inorganic salt Inorganic materials 0.000 abstract description 7
- 238000002844 melting Methods 0.000 abstract description 4
- 230000008018 melting Effects 0.000 abstract description 4
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 28
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 15
- 229910052938 sodium sulfate Inorganic materials 0.000 description 15
- 239000011780 sodium chloride Substances 0.000 description 14
- 235000011152 sodium sulphate Nutrition 0.000 description 14
- 238000001704 evaporation Methods 0.000 description 8
- 239000007789 gas Substances 0.000 description 8
- 230000008020 evaporation Effects 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 239000002351 wastewater Substances 0.000 description 6
- 239000012535 impurity Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 239000006227 byproduct Substances 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000012452 mother liquor Substances 0.000 description 3
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical class O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000012267 brine Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000010842 industrial wastewater Substances 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- 239000007832 Na2SO4 Substances 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 150000001721 carbon Chemical class 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000002920 hazardous waste Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000011833 salt mixture Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/40—Destroying solid waste or transforming solid waste into something useful or harmless involving thermal treatment, e.g. evaporation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B2101/00—Type of solid waste
- B09B2101/02—Gases or liquids enclosed in discarded articles, e.g. aerosol cans or cooling systems of refrigerators
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a resource treatment method after carbonization of industrial polluted salt, which comprises the following steps: (1) sending industrial sewage salt containing certain moisture into drying equipment for pre-drying, so that the moisture content in the industrial sewage salt is reduced to below 1%; (2) introducing the pre-dried industrial polluted salt into a carbonization furnace, and carbonizing at 600-800 ℃ to remove organic matters in the polluted salt; (3) cooling the carbonized polluted salt, introducing the cooled polluted salt into a salt dissolving system for dissolving, and then sequentially carrying out primary filtration and ultrafiltration to remove carbon black generated in the carbonization process; (4) introducing the filtered solution into a softener, adding a softening agent into the softener, and standing for 30-60 min to settle precipitates; (5) and introducing the softened polluted salt solution into an evaporative crystallization system for salt separation treatment. The resource treatment method after the carbonization of the industrial polluted salt can effectively prevent the industrial polluted salt from melting, caking and bonding, thoroughly decompose and carbonize organic matters, and improve the purity of inorganic salt.
Description
Technical Field
The invention relates to the technical field of waste recycling treatment, in particular to a recycling treatment method for carbonized industrial waste salt.
Background
In the production process of a plurality of organic or inorganic chemical products, a large amount of high-salt wastewater is generated due to process requirements, wherein the content of sodium chloride and sodium sulfate is higher than 2%, the content of sodium chloride and sodium sulfate is more than 10%, and the content of sodium chloride and sodium sulfate is even more than 20%, and the high-salt wastewater is high-salt wastewater which is mostly subjected to evaporative crystallization or MVR evaporative crystallization in the currently mature treatment process; this produces a large amount of by-product miscellaneous salts (mixed salts of NaCl and sodium sulfate). The sodium chloride/sodium sulfate content of the salt is more than 95 percent, and simultaneously, the salt contains a large amount of organic or inorganic impurities, can not be directly used as industrial raw material salt, can not be used for food or medical use, and is stockpiled by most manufacturers. The long-term stacking of the mixed salt of sodium chloride and sodium sulfate not only occupies a large amount of fields, but also has great threat to the environment, salt and impurities are easy to lose, the surrounding soil is salinized, the surrounding vegetation is endangered, and meanwhile, the mixed salt causes pollution to surrounding rivers, water sources, rice fields and the like.
At present, the treatment method adopted for the byproduct polluted salt generated by the industrial high-salinity wastewater mainly comprises the following steps: burying, washing, high-temperature burning, carbonizing and the like. The landfill method has simple treatment mode, but occupies a large amount of land resources, and the poor treatment easily causes pollution to soil and underground water resources, thereby bringing great threat to the living environment of people. The washing method mainly adopts water washing and chemical solvents to treat the polluted salt, the method has accurate control on the dosage of the chemical solvents, and secondary hazardous wastes are easy to generate. The high-temperature incineration means that harmful organic materials in the polluted salt are decomposed or removed through high-temperature oxidation incineration, the purpose of harmless treatment is achieved, inorganic salt melting is not needed to be controlled, the harmful materials are prevented from being produced, the operation technology difficulty is high, and the polluted salt melting, caking, bonding or equipment blocking is easily caused.
Disclosure of Invention
The invention aims to solve the technical problem of providing a resource treatment method for carbonized industrial waste salt, so as to solve various defects of the conventional treatment method.
In order to solve the technical problem, the invention provides a resource treatment method of carbonized industrial waste salt, which comprises the following steps:
(1) sending industrial sewage salt containing certain moisture into drying equipment for pre-drying, so that the moisture content in the industrial sewage salt is reduced to below 1%;
(2) introducing the pre-dried industrial polluted salt into a carbonization furnace, and carbonizing at 600-800 ℃ to remove organic matters in the polluted salt;
(3) introducing carbonized polluted salt into a salt dissolving system for dissolving, and then sequentially carrying out primary filtration and ultrafiltration to remove carbon black generated in the carbonization process;
(4) introducing the filtered solution into a softener, adding a softening agent into the softener, and standing for 30-60 min to settle precipitates;
(5) and introducing the softened polluted salt into an evaporative crystallization system for salt separation treatment.
Further, in the step (1), the drying equipment is a fluidized bed, and the drying temperature is 70-80 ℃. Drying is carried out in a fluidized bed mode, so that the water content of industrial polluted salt can be quickly reduced to be lower than 1%, the energy consumption is remarkably reduced, and the polluted salt can be prevented from being solidified in the drying process. Of course, other drying means may be used.
Further, in the step (2), the carbonization time is 6-8 h.
Further, in the step (2), the gas generated by carbonization is sent to a tail gas treatment system for harmless treatment. The innocent treatment comprises the following steps: and introducing gas generated by carbonization into a combustion device for combustion, and recovering waste heat from the generated tail gas.
Further, in the step (3), the primary filtering equipment is a filter press, and the pressure is 6-8 kg; the size of the mesh of the filter screen for ultrafiltration is 0.01-0.1 μm. The solid carbon particles in the contaminated salt solution are thoroughly separated by primary filtration and ultrafiltration.
And (3) further, in the step (3), introducing the filtered substances of the primary filtration and the ultrafiltration into a filter cake dissolving tank for dissolving, and performing pressure filtration on the dissolved solution through a pressure filter to obtain the carbon black for later use.
Further, in the step (4), the softening agent is sodium carbonate and sodium hydroxide, and Ca in the solution is enabled to be contained by adding the softening agent2+、Mg2+And precipitating metal impurity ions.
Further, in the step (5), the evaporative crystallization adopts a salt and nitrate co-production process.
The invention has the beneficial effects that:
1. the invention adopts a low-temperature carbonization technology, and technological parameters such as carbonization temperature, time and the like can be adjusted and controlled along with the physicochemical characteristics of materials, so that toxic and harmful organic substances which are complex in components, high in content and difficult to degrade in the polluted salt can be effectively removed, the decomposition and carbonization are more sufficient and thorough, and the technical problems that inorganic salt is easy to melt, agglomerate, bond with equipment, cannot continuously run and the like in the carbonization process are solved.
2. According to the resource treatment method, the carbonized polluted salt is subjected to salt melting, filtering, softening and evaporative crystallization treatment again, so that the purity of the inorganic salt is obviously improved, the inorganic salt can be reused, secondary wastes which are difficult to treat are not generated in the production process, the waste of resources is reduced, the damage of waste water to the environment is reduced, and the resource treatment method has good economic and social benefits.
Drawings
FIG. 1 is a flow chart of a method for recycling inorganic salts in industrial wastewater according to the present invention;
FIG. 2 is a process flow diagram of the one-time planning of the polluted salt reclamation of example 1.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
As described in the background art, the treatment methods adopted for the byproduct polluted salt generated by the industrial high-salinity wastewater at present mainly include: burying, washing, high-temperature burning, carbonizing and the like. However, these methods have inherent disadvantages, which limit the resource utilization of inorganic salts in industrial wastewater.
Referring to fig. 1, in order to solve the technical problem, the invention provides a method for treating industrial waste salt after carbonization for recycling, which comprises the following steps:
(1) sending industrial sewage salt containing certain moisture into drying equipment for pre-drying, so that the moisture content in the industrial sewage salt is reduced to below 1%;
(2) introducing the pre-dried industrial polluted salt into a carbonization furnace, and carbonizing at 600-800 ℃ to remove organic matters in the polluted salt;
(3) introducing carbonized polluted salt into a salt dissolving system for hydrolysis, and then sequentially carrying out primary filtration and ultrafiltration to remove carbon black generated in the carbonization process;
(4) introducing the filtered solution into a softener, adding a softening agent into the softener, and standing for 30-60 min to settle precipitates;
(5) introducing the softened polluted salt into an evaporative crystallization system for salt separation treatment;
(6) and dehydrating and drying the separated salt to obtain refined salt.
In the invention, the industrial polluted salt generally contains 40-50% of water, and the water content of the industrial polluted salt is rapidly reduced to below 1% by a pre-drying means, so that the industrial polluted salt forms particles with good fluidity so as to be convenient for carbonization. The pre-drying can adopt a drying mode commonly used in the field, preferably fluidized bed drying, and the drying temperature is preferably 70-80 ℃. The fluidized bed drying is adopted, so that the drying speed is high, the energy consumption is reduced, and the solidification of the polluted salt in the drying process can be prevented.
And (4) carbonizing the pre-dried polluted salt in a carbonization furnace, wherein the carbonization time is preferably 6-8 h. Organic matters in the polluted salt are converted into solid carbon particles through carbonization, and a carbon salt mixture is formed. The invention adopts a low-temperature carbonization process, the carbonization temperature of the low-temperature carbonization process is lower than that of the conventional carbonization process, and the technical problems that inorganic salt is melted, agglomerated and bonded with equipment, the equipment cannot continuously run and the like in the carbonization process are solved.
And (3) sending the gas generated after carbonization into a tail gas treatment system for harmless treatment, wherein the harmless treatment comprises the following steps: and introducing gas generated by carbonization into a combustion device for combustion, and recovering waste heat from the generated tail gas.
In the invention, the primary filtering equipment is a filter press, and the pressure is 6-8 kg; the size of the mesh of the filter screen for ultrafiltration is 0.01-0.1 μm. Through primary filtration and ultrafiltration, solid carbon particles in the polluted salt solution are thoroughly separated, which is beneficial to improving the purity of subsequent inorganic salt.
In order to realize the recycling of carbon particles in the polluted salt, the filtered substances of primary filtration and ultrafiltration are introduced into a filter cake dissolving tank for dissolving, and the dissolved solution is subjected to filter pressing by a filter press to obtain carbon black, and the carbon black is recovered for later use after being dried.
In the invention, the softening agent is sodium carbonate and sodium hydroxide, and Ca in the solution is enabled to be contained by adding the softening agent2+、Mg2+And the purity is further improved by metal impurity ion sedimentation.
In the invention, the evaporative crystallization system can adopt a single-effect evaporation mode, a multi-effect evaporation mode or an MVR evaporation mode.
Example 1
The first-stage planning of the waste salt recycling of 2 production lines in a certain place has the total salt amount of 3 ten thousand tons/h, takes sodium chloride and sodium sulfate as main materials, and has the following raw material classification: 2.25 ten thousand tons of NaCl per year, 0.75 ten thousand tons of Na2SO4. The sodium chloride production line considers a capacity of 0.4 ten thousand tons/year in the fourth phase.
Referring to fig. 2, dry salt generated in a carbonization workshop enters a salt dissolving system and is dissolved into undersaturated brine; removing impurities which affect the salt quality, such as carbon black, calcium, magnesium, heavy metals and the like in the brine through a filtering system and a softening system; pumping the pretreated brine to a sodium chloride low-temperature evaporation system for evaporation and crystallization, carrying out solid-liquid separation on supersaturated solution through a centrifuge to obtain crystallized salt, continuously concentrating sodium sulfate in centrifugal mother liquor, discharging the mother liquor to the sodium sulfate high-temperature evaporation system when the sodium sulfate is close to saturation, separating out sodium sulfate due to reduction of solubility, changing sodium chloride into unsaturated components due to increase of solubility, further separating out sodium sulfate by continuously evaporating water, gradually enabling the concentration of sodium chloride to be close to the saturation point under the temperature condition, and discharging the sodium sulfate centrifugal mother liquor to the sodium chloride low-temperature evaporation system. The sodium chloride and the sodium sulfate are separated by recycling.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (7)
1. A treatment method for recycling industrial polluted salt after carbonization is characterized by comprising the following steps:
(1) sending industrial sewage salt containing certain moisture into drying equipment for pre-drying, so that the moisture content in the industrial sewage salt is reduced to below 1%;
(2) introducing the pre-dried industrial polluted salt into a carbonization furnace, and carbonizing at 600-800 ℃ to remove organic matters in the polluted salt;
(3) cooling the carbonized polluted salt, introducing the cooled polluted salt into a salt dissolving system for dissolving, and then sequentially carrying out primary filtration and ultrafiltration to remove carbon black generated in the carbonization process;
(4) introducing the filtered solution into a softener, adding a softening agent into the softener, and standing for 30-60 min to settle precipitates;
(5) and introducing the softened polluted salt solution into an evaporative crystallization system for salt separation treatment.
2. The method for treating carbonized industrial waste salt as claimed in claim 1, wherein in the step (1), the drying equipment is a fluidized bed, and the drying temperature is 70-80 ℃.
3. The method for treating carbonized industrial waste salt as claimed in claim 1, wherein in the step (2), the carbonization time is 6-8 h.
4. The method according to claim 1, wherein in the step (2), the gas generated by the carbonization is sent to a tail gas treatment system for harmless treatment.
5. The method for recycling the carbonized industrial waste salt as claimed in claim 1, wherein in the step (3), the primary filtering equipment is a filter press, and the pressure is 6-8 kg; the size of the mesh of the filter screen for ultrafiltration is 0.01-0.1 μm.
6. The method for recycling industrial waste salt after carbonization as claimed in claim 1, wherein in the step (3), the filtered substances obtained by primary filtration and ultrafiltration are introduced into a filter cake dissolving tank for dissolution, and the dissolved solution is subjected to pressure filtration by a filter press to obtain the carbon black for recycling.
7. The method for treating industrial waste salt as reclaimed after carbonization as claimed in claim 1, wherein in the step (4), the softening agent is sodium carbonate and sodium hydroxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010590294.3A CN111715664A (en) | 2020-06-24 | 2020-06-24 | Treatment method for recycling carbonized industrial waste salt |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010590294.3A CN111715664A (en) | 2020-06-24 | 2020-06-24 | Treatment method for recycling carbonized industrial waste salt |
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| CN111715664A true CN111715664A (en) | 2020-09-29 |
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| CN202010590294.3A Pending CN111715664A (en) | 2020-06-24 | 2020-06-24 | Treatment method for recycling carbonized industrial waste salt |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115246649A (en) * | 2021-08-09 | 2022-10-28 | 江苏美东环境科技有限公司 | Method for preparing fertilizer-grade potassium chloride from potassium chloride organic hazardous waste salt |
| CN115246650A (en) * | 2021-08-09 | 2022-10-28 | 江苏美东环境科技有限公司 | Method for preparing industrial potassium sulfate from hazardous organic waste salt containing potassium chloride and sodium sulfate |
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- 2020-06-24 CN CN202010590294.3A patent/CN111715664A/en active Pending
Patent Citations (5)
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| CN107803395A (en) * | 2017-12-11 | 2018-03-16 | 广州叶林环保科技有限公司 | A kind of organic abraum salt low-temperature carbonization handling process |
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| CN115246649A (en) * | 2021-08-09 | 2022-10-28 | 江苏美东环境科技有限公司 | Method for preparing fertilizer-grade potassium chloride from potassium chloride organic hazardous waste salt |
| CN115246650A (en) * | 2021-08-09 | 2022-10-28 | 江苏美东环境科技有限公司 | Method for preparing industrial potassium sulfate from hazardous organic waste salt containing potassium chloride and sodium sulfate |
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Application publication date: 20200929 |